How do I disconnect my Dexcom CGM transmitter from my Dexcom receiver?

Disconnecting your transmitter from the receiver, Dexcom G5 and G6 CGM systems

If you are having difficulty pairing your Dexcom CGM with your t:slim X2 insulin pump, it may be because your Dexcom transmitter and receiver are still linked. A single transmitter cannot be connected to both your insulin pump and a Dexcom receiver at the same time.

Follow these steps to properly disconnect your Dexcom transmitter from the receiver and reconnect with the t:slim X2 Insulin Pump.

1. Before entering your transmitter ID into the t:slim X2 insulin pump, turn off the Dexcom receiver and wait 15 minutes. This allows the Dexcom transmitter to forget the connection currently in place with the Dexcom receiver.

2. Enter the Dexcom transmitter ID into your t:slim X2 insulin pump and start a CGM session. This will start the process of searching for the transmitter.

  1. If you were in the middle of a sensor session prior to getting an out-of-range message, data will begin to display once the transmitter and t:slim X2 insulin pump have connected.
  2. If you are starting a new sensor session, you will follow the normal two-hour startup period for a new session.

3. Leave the Dexcom receiver off and store in a safe place. If the receiver is turned back on, it could interfere with the connection between your transmitter and the t:slim X2 pump.

Note: The Dexcom CGM systems only allow pairing with one medical device at a time, but you may still use a smartphone with the Dexcom Mobile App and your t:slim X2 insulin pump simultaneously with the same transmitter ID.

Download the above information on disconnecting the Dexcom transmitter from the receiver in PDF format >

Important note about Dexcom support:

Dexcom and Tandem have agreed which system issues are best handled by each company, including which company is responsible for reporting those events to the appropriate regulatory authority. To help ensure that the required reporting takes place in a timely fashion, customers may need to contact Dexcom for some issues and Tandem for others.

Tandem handles issues such as loss of connection (on pump only) and the invalid transmitter (Alert 29) on pump only.

For all other CGM issues, including would not accept calibration, the sensor failure during the 2-hour warmup, “no restarts” alert or physical problems with your sensor or transmitter, such as bleeding, bruising, skin reaction, adhesive issues, applicator issues, or broken wires, you should contact Dexcom using one of the options at

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